An inductively coupled plasma atomic emission spectrometer （ICP-AES） was developed to continuously measure the heavy metals concentrations in flue gas in order to track the metal release process.The system is devote...An inductively coupled plasma atomic emission spectrometer （ICP-AES） was developed to continuously measure the heavy metals concentrations in flue gas in order to track the metal release process.The system is devoted to the thermal treatment of metal-spiked mineral matrix, coal and municipal solid wastes in fluidized bed （850℃）.This method was used to study the kinetics of heavy metals release.The optimum values of the gas flows from the 1200 W power generator were 0.1 L·min -1 for the sample gas and 0.2 L·min -1 for argon.During the thermal treatment of coal and municipal solid waste,Cd and Pb were released readily,while Zn was released at a lower level than Cd and Pb.The formation of stable compounds such as ZnO·Al2O3 and CdO·Al2O3 from the reaction of heavy metals with fly ash particles could decrease heavy metals release.In all cases, the experimental setup was successfully used to monitor the heavy metal release process during coal and solid waste thermal treatment.展开更多
Incineration experiments with MSW, which had been impregnated with heavy metals, were presented to obtain information on the volatilization behavior of the elements cadmium(Cd), lead(Pb), and zinc(Zn) under different ...Incineration experiments with MSW, which had been impregnated with heavy metals, were presented to obtain information on the volatilization behavior of the elements cadmium(Cd), lead(Pb), and zinc(Zn) under different conditions. Experiments were carried out in a bubbling fluid bed system connected to a customized inductively coupled plasma optical emission spectroscopy(ICP-OES) for analyzing metals in the flue gas. The results indicated that the combustion temperature, the gas atmosphere, and the chlorine content in the flue gas could affect the volatilization behavior of heavy metals. In the fluidized bed combustion, a large surface area was provided by the bed sand particles, and they may act as absorbents for the gaseous ash-forming compound. Comparer with the metals Cd and Pb, the vaporization of Zn was low. The formation of stable compounds such as ZnO·Al 2O 3 could greatly decrease the metals volatilization. The presence of chlorine would enhance the volatilization of heavy metals by increasing the formation of metal chlorides. However, when the oxygen content was high, the chlorinating reaction was kinetically hindered, which heavy metals release would be delayed.展开更多
文摘An inductively coupled plasma atomic emission spectrometer （ICP-AES） was developed to continuously measure the heavy metals concentrations in flue gas in order to track the metal release process.The system is devoted to the thermal treatment of metal-spiked mineral matrix, coal and municipal solid wastes in fluidized bed （850℃）.This method was used to study the kinetics of heavy metals release.The optimum values of the gas flows from the 1200 W power generator were 0.1 L·min -1 for the sample gas and 0.2 L·min -1 for argon.During the thermal treatment of coal and municipal solid waste,Cd and Pb were released readily,while Zn was released at a lower level than Cd and Pb.The formation of stable compounds such as ZnO·Al2O3 and CdO·Al2O3 from the reaction of heavy metals with fly ash particles could decrease heavy metals release.In all cases, the experimental setup was successfully used to monitor the heavy metal release process during coal and solid waste thermal treatment.
文摘Incineration experiments with MSW, which had been impregnated with heavy metals, were presented to obtain information on the volatilization behavior of the elements cadmium(Cd), lead(Pb), and zinc(Zn) under different conditions. Experiments were carried out in a bubbling fluid bed system connected to a customized inductively coupled plasma optical emission spectroscopy(ICP-OES) for analyzing metals in the flue gas. The results indicated that the combustion temperature, the gas atmosphere, and the chlorine content in the flue gas could affect the volatilization behavior of heavy metals. In the fluidized bed combustion, a large surface area was provided by the bed sand particles, and they may act as absorbents for the gaseous ash-forming compound. Comparer with the metals Cd and Pb, the vaporization of Zn was low. The formation of stable compounds such as ZnO·Al 2O 3 could greatly decrease the metals volatilization. The presence of chlorine would enhance the volatilization of heavy metals by increasing the formation of metal chlorides. However, when the oxygen content was high, the chlorinating reaction was kinetically hindered, which heavy metals release would be delayed.
